Honing device



3 Sheets-Sheet 1 April 23, 1968 J. SUNNEN HONING DEVICE Filed March 6, 1964.

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United States Patent 3,378,962 HONING DEVICE Joseph Sunnen, 400 5. Warson Road, Clayton, Mo. 63105 Filed Mar. 6, 1%4, Ser. No. 349,892 22 Claims. ((Il. 51339) The present invention relates generally to devices for honing, grinding and finishing cylindrical surfaces and the like and more particularly to a rotatable head for use on honing, grinding and finishing machines.

Many different honing, grinding and finishing devices have been employed heretofore in the accurate forming, sizing and finishing of surfaces such as the cylinder walls of an automobile engine block and the like. Many of the known devices include rotatable honing heads or mandrels which carry honing or abrading elements as well as guide members. In such structures the honing or abrading elements enlarge or finish the cylinder walls while the guide members or shoes are provided to stabilize the structure and to provide support for the honing and abrading elements. In all known constructions having abrasive elements and guides on the same rotating structure, the abrasive elements and guides are mounted in opposed pairs on opposite sides of perpendicular diameters of the rotating structure and all must therefore be maintained on the same honing diameter at all times and under all load conditions. The present structure, on the other hand, has three instead of four elements which determine the honing diameter and for this and other reasons has certain advantages over the known structures. Among the advantages of the present device is the fact that it is more stable, less subject to vibration and chatter and therefore is less noisy, and it also has less tendency for its axis of rotation to tilt. These advantages also enable the subject device to produce more uniform wear of the abrasive elements and guides. It is also possible with the present improved structure to maintain the surface engaging elements under more uniform pressure against a surface being honed thereby also making the subject device easier to control. The present device also includes stabilizing means which engage the surface being honed during the beginning portion of a honing operation to establish an initial correct movement pattern for the device and also to properly orient the device and to prevent tilting thereof. A second guide member may also optionally be provided on the subject device for finishing operations and to further load and stabilize the structure. The second guide member also helps to prevent damage to the other elements when the structure is positioned in a hole to be honed. The second guide, unlike the other surface engaging elements, is yieldably supported on the structure, and therefore does not enter into the determination of the honing diameter. These and other advantages of the subject device enable it to produce more nearly perfectly honed surfaces and also enables it to have an improved wear condition for all of the surface engaging elements thereof. For these same reasons, the subject device requires relatively less maintenance and less replacement of parts.

The present device comprises a rotatable body having two spaced honing or abrading elements which are movable into engagement with a surface to be honed, and at least one guide element which also engages the surface to be honed. In the present construction the above three elements determine the honing diameter of the structure and also enable the device to have greatly improved operating characteristics and improved operating stability. The subject device may optionally also have a second guide element for finishing and stabilizing purposes which element is yieldable on the body and is self-adjusting and therefore does not enter into the determination of the honing diameter of the device. The second guide also protects the wear elements against damage during installation in a bore and to some extent loads the other elements and contributes to the operating stability. The subject device includes two other auxiliary or stabilizing guide elements each of which is positioned substantially in alignment respectively with one of the abrasive elements. The stabilizing guide elements initially establish a correct pattern of motion for the device so that all of the aforementioned elements will wear more evenly and will produce more nearly perfectly honed surfaces. The stabilizing guide elements are adjusted to engage a surface to be honed substantially only during the early portion of each honing operation.

The present device, therefore, achieves an improved operating and wear condition for all of the active elements, and increases the accuracy of the surfaces being honed. The subject device also includes improved means for advancing selected elements radially outwardly in order to maintain engagement with a surface during honing thereof, and in the subject device all of the surface engaging elements and parts can be quickly and accurately installed, adjusted, and replaced even by relatively unskilled personnel.

It is a principal object of the present invention to provide improved means for accurately honing, abrading, enlarging and finishing cylindrical surfaces and the like.

Another object is to improved the stability and other operating characteristics of honing devices and the like.

Another object is to provide relatively inexpensive means for accurately honing cylindrical surfaces.

Another object is to improve the wear characteristics and prolong the life of the wear elements on honing and like devices.

Another object is to provide honing means which can be installed on new as well as on existing machines.

Another object is to provide honing means which can be quickly and accurately adjusted even by relatively unskilled personnel.

Another object is to provide a honing device that can be adjusted and expanded to cover a wide range of honing operations.

Another object is to reduce lost time required to replace and adjust the wear elements on honing and the like devices.

Another object is to provide means for improving the pattern of movement of honing devices and the like.

Another object is to provide improved means for radially expanding the honing diameter of a honing device.

Another object is to minimize part breakage in honing and abrading devices.

These and other objects and advantages of the present invention will become apparent to those skilled in the art after considering the following detailed specification which covers a preferred embodiment thereof in conjunction with the accompanying drawings, wherein:

FIG. 1 is a side elevational view of a honing device constructed according to the present invention;

FIG. 2 is another elevational view of the same device as seen from the right in FIG. 1;

FIG. 3 is a top plan view of the device of FIG. 1;

FIG. 4 is a cross-sectional elevational view taken on line P4 of FIG. 2;

FIG. 5 is a cross-sectional view similar to FIG. 4 but showing the device in an expanded condition;

FIG. 6 is a cross-sectional view taken on line 66 of FIG. 4 with the figure shown inverted;

FIG. 7 is a fragmentary cross-sectional view taken on line 77 of FIG. 2;

FIG. 8 is a cross-sectional view taken on line 8-8 of FIG. 4;

FIG. 9 is a cross-sectional view taken on line 99 of FIG. 4; and

FIG. 10 is a perspective view of a typical shim for use on the subject device.

Referring to the drawing more particularly by reference numbers, the number 10 refers to a honing or abrading tool or head constructed according to the present invention. The head 10 is designed to be used on a honing or abrading machine and includes an elongated body 12 which is substantially trapezoidal in cross-section having opposite non-parallel surfaces 14 and 16, and other opposite substantially parallel surfaces 18 and 20 (FIGS. 3, 6, 8 and 9). The body 12 also has an endwardly extending integral portion 22 which has two opposed spherical surface portions 24 formed thereon. The extension 22 also has opposed threaded bores 26 formed therein (FIGS. 4 and 5), and an annular ring member 30 is positioned extending around the extension 22. The ring 30 has four spaced holes 32 therethrough located 90 apart, and two opposite holes 32 cooperate with the cylindrical ends of associated threaded members 34 which are positioned in the bores 26. This enables the ring 30 to rotate on the heads of the threaded members 34. The other two opposite holes 32 in the ring 30 are used in the mounting of the head 10 on a honing machine or like device (not shown). The head 10 is therefore allowed considerable freedom of movement on its mounting thereby enabling it to be self-orienting.

A cylindrical bore 36 extends lengthwise through the body 12 and slidably receives an adjustment member 38. The adjustment member 38 has a threaded upper end portion 40 which cooperates with another threaded member 42. The member 42 extends out from the upper end of the cylindrical bore 36 and has an upper forked end portion formed by two similar portions 44. The member 42 also has an enlarged annular portion 46 which engages the upper surface of a bearing assembly 48. The lower surface of the bearing assembly 48 engages the upper end surface of the main portion of the body 12. The forked upper ends 44 have bores 50 therethrough which cooperate to connect the member 42 to adjustment means on a honing machine for rotating the member 42 to change the position of the adjustment member 38 in the cylindrical bore 36.

The adjustment member 38 has two spaced cut-out portions formed in two opposite sides thereof, and each of the four cut-outs define a cam surface used for adjustment purposes. The four cam surfaces are numbered respectively 52, 54, 56 and 58 (FIGS. 4 and 5). The cam surfaces 52, and 58 are located on one side of the member 38 and the cam surfaces 54 and 56 are located on the opposite side thereof. The surfaces 52 and 58 are preferably not located exactly on opposite sides of the member 38 from the surfaces 54 and 56 but are nearly so located. This is done to provide three stable points of contact between the subject device and a surface to be honed. On an actual device the surfaces on opposite sides of the members are spaced about 170 apart as are the assemblies associated therewith. The member 38 also has a sidewardly extending stud 60 attached near the bottom end thereof. The stud 60 slidably cooperates with a groove 62 formed in the body 12 to prevent rotation of the member 38 in the body and t9 K6 fi a Surfllws 52, 54, 56 and 58 properly oriented with the associated assemblies in all positions thereof.

Two adjustable honing assemblies identified generally by the numbers 64 and 66 are mounted on opposite sides of the head 12 adjacent to the body surfaces 14 and 16. The assemblies 64 and 66 are similar in construction and each includes an abrasive member or stone 68, a backing 70 for the stone, and a support portion 72 on which the backing is mounted. The stone 68 and backing 70 for each assembly are constructed as a unit and are easily and quickly replaceable on the supports 72. Each of the supports 72 also has two spaced mounting pins 74 positioned extending from the side thereof opposite from the stone 68 (FIGS. 5 and 8). The mounting pins 74 on the two assemblies 64 and 66 are preferably spaced the same distance apart so that the assemblies 64 and 66 are interchangeable but the two pins 74 on each assembly are preferably of different diameters to prevent the assemblies from being installed upside down.

The two stone assemblies 64 and 66 are radially adjustable on the head by means which cooperate with the cam surfaces 52, 54, 56 and 58 on the adjustment member 38. The adjustment means for the assembly 64 include two pins 76 and 78 which are positioned in associated bores 80 and 82 respectively in the body 12. The pins 76 and 78 have beveled inner end surfaces 76a and 78a which slidably cooperate with the cam surfaces 52 and 58 respectively, and outer end surfaces which engage the support member 72. In FIG. 4 the pins 76 and 78 are shown in their most retracted condition which is the condition in which the stone assembly 64 is least radially extended on the head. The pins 76 and 78 are shown round in crossse-ction and each pin also has a fiat 76b and 78b formed thereon which flats freely slidably cooperate with the ends of a retainer plate member 84 that is attached to the body 12 by a screw 85. The retainer plate 84 prevents the pins from coming out of the body, and also keeps the pins properly oriented so that the surfaces 76a and 78:: remain in surf-ace-t-o-surface contact with the associated cam surfaces 52 and 58 respectively.

Two similar pins 86 and 88 are provided for adjusting the radial position of the assembly 66. The pins 86 and 88 are similar in construction to the pins 76 and 78 and operate in the same way to adjust the radial position of the assembly 66. The pins 86 and 88 have beveled end surfaces 86a and 88a which cooperate with the cam surfaces 54 and 56 respectively, and flats 86b and 88b which cooperate with retainer plate 90. The retainer plate 90 is attached to the body 12 by a screw 92. It should be noted also that the adjustment pins 86 and 88 are spaced differently than the adjustment pins 76 and 78 for convenience in locating them on the body. The adjustment pins for both stone assemblies are also preferably located directly behind or under the associated stones 68 to provide the best possible support therefor. The mounting pins 74 for the stone assemblies 64 and 66, on the other hand, are preferably located forwardly of the associated stones 68 relative to the direction of rotation of the device to prevent the assemblies from binding on a cylinder surface being honed.

In order to expand the range of diameters that can be honed by the subject head, it is contemplated to position shims between the support members 72 and the adjacent surfaces of the body 12. Any desired number and thickness of shims can be provided for this purpose depending upon the required honing diameter. A typical shim for this purpose is shown in FIG. 10. The shim includes a plate-like member 94 having two spaced holes 96 positioned and sized to receive the mounting pins 74 therethrough. The shims 94 are preferably large enough to provide support for the entire area of the associated support members. The operation of the subject device is not changed by the addition of shims except for the fact that the adjustment pins 76, 78, 86 and 88 engage the shims rather than the supports 72.

The threaded upper end portion of the adjustment member 38 cooperates with an internally threaded portion 98 of the member 42. Adjustment of the radial positions of the stone assemblies 64 and 66 is made by means on the honing machine which rotate the member 42 relative to the head and thereby longitudinally moves the member 38 in the bore 36. When the member 42 is rotated in one direction the member 38 will move upwardly in the bore 36, and in so doing the cam surfaces 52-53 will also move upwardly thereby advancing their associated adjustment pins outwardly to increase the honing diameter of the tool. Thereafter, the honing diameter can be further expanded or reduced simply by turning the member 42 in the desired direction. Means are also usually provided in the honing machine to maintain predetermined pressure on the stones against the surface being honed. This is accomplished by applying additional turning force on the member 42 in a direction to apply additional upward pressure on the adjustment member 38. At the beginning of a honing operation, however, the member 38 is usually set at or near a position in which all of the assemblies including the stone assemblies 64 and 66 are able to freely enter a hole to be honed. During the honing the stone assemblies will then be moved outwardly under predetermined pressure applied thereto by the aforementioned means in the honing machine until at the conclusion of the operation the desired hole size is obtained and yet the full adjustment travel has not been used. The controls in the honing machine for advancing the stones and for controlling the pressure and the final hole size are not part of the present invention.

The head 10 also has a main guide assembly which includes a relatively soft but long Wearing guide shoe 102 made of metal or other suitable material, a support 104 for the shoe 102, and mounting pins 106 which ex tend into suitable bores 168 in the body 12. The pins 106 are preferably of different size to prevent installing in reverse position. The guide assembly 190 is nonresiliently positioned on the head and is adjustable radially to a desired honing diameter by means of shims similar to the shim 94 shown in FIG. 10. The pins 106 are also mounted ahead of the shoe 102 to prevent binding.

The two stone assemblies 64 and 66 and the guide assembly 100 provide three relatively non-yieldable contact points or areas which engage a surface being honed and which determine the honing diameter or" the subject head 11 The particular relationship between these assemblies including the unequal spacing therebetween enables the device to produce more nearly perfectly round surfaces with most of the pressure being on the nearly opposite stone assemblies 64 and 66. This diameter may be changed either by means of shims or by moving the member 38 to radially move the stone assemblies. The guide 100 can also be made adjustable, if desired, although this is usually not required. The three points of Contact described above provide a very stable operating condition for the subject head.

Provision is also made on the subject head for an optional finishing guide assembly 110. The finishing guide 110 is preferably formed of a relatively soft but long wearing metal and has two mounting pins 112 which are positioned in bores 114 in the body 12.

The finishing guide 110 is spring loaded by means of a spring biased plunger 116 (FIG. 7). The plunger 116 has a head end 118 which normally extends outwardly beyond the body surface 18. A spring 120 is positioned in a bore 122 in thebody between the head end of the plunger and the end of the bore. The bore 122 communicates with another bore 124 that extends through the body and receives the plunger 116. The opposite end of the plunger 116 from the head 118 extends out from the opposite end of the bore 12-4 and carries a horseshoe clip or similar device 126 which retains the plunger in the body. The plunger 116 is provided to spring load the finishing guide 1119 by biasing it into engagement with the surface being honed and also to enable the finishing guide to be self-adjusting. Since the finishing guide 110 is biased outwardly instead of being fixed, however, it does not enter into a determination of the honing diameter of the tool. The main purpose of finishing guide assembly 110 is to prevent damage to the stone assemblies and particularly to the corners of the stones during installing in a hole by centering the head in the hole. The assembly 110 also loads the other assemblies to some extent, and therefore contributes to the overall operating stability and improved operation of the subject device. The finishing guide assembly 110 is also adjustable by means of shims similar to the shim 94 in FIG. 10.

In addition to the stone assemblies 64 and 66, the main guide assembly 160, and the finishing guide assembly 110 the subject head is also provided with two stabilizing guide assemblies 132 and 134. The stabilizing guide assemblies 132 and 134 are similar in construction and each includes a relatively soft but long wearing metal wear shoe 136 which is mounted on a support member 138. The supports 133 also have a pair of mounting pins 146 movably attached thereto. The mounting pins 140 cooperate with body bores 142, and one stabilizing guide assembly is aligned with each of the stone assemblies 64 and 66. The mounting pins 149 have reduced diameter end portions 144 which extend through holes in the associated supports 138 and which are fixedly connected to plate 146 as shown in FIGS. 3 and 6. A spring member 148 (FIG. 6) is positioned between the support members 138 and each of the mounting pins 146 to bias the supports outwardly and also to enable the guides 132 and 134 tohave limited pivotal movement on the pins 140. Each of the assemblies 132 and 134 is provided with two mounting pins 140 and the mounting pins on each assembly are provided with adjustable bracket assemblies which include two members 150 and 152 connected together by a threaded member 154. The bracket members 150 and 152 are suitable notched to cooperatively engage the pins 140 from opposite sides, and when the threaded members 154 are tightened, the members 159 and 152 clamp on the associated mounting pins 140 and control the radial positions of the associated guide assemblies 132 and 134. When loosened, however, the bracket assemblies can be moved longitudinally along the pins 140 to change the adjustment.

The outer bracket members 1 50 have angularly related surfaces on one side thereof which form edges 156 that cooperate with the end portions of spring members 158 as shown in FIG. 6. The spring members 158 are of formed metal having forked end portions which receive the threaded members 154 therebetween. The spring members 153 are fastened to the body of the subject device by means of screws 16% or the like.

The stabilizing guides 132 and 134 are axially aligned with the respective stone assemblies 64 and 66 and are adjusted to extend radially outwardly on the body the same distance or even slightly further than the associated stone assemblies 64 and 66 at the beginning of a honing operation. This is done so that at the beginning of a honing operation the guides 132 and 134 will engage the surface being honed with suflicient force to properly orient and stabilize the subject head. By so doing they will also establish a proper pattern of head movement. In this connection it should also be noted that the wear portions 136 of the stabilizing guides 132 and 134 are rounded or beveled at 136a to enable them to easily enter a hole during movement of the head therein. Thus the stabilizing guides perform their main functions at or near the beginning of each honing operation. Thereafter, during the honing operation the stabilizing guides will become relatively less important and may eventually no longer engage the hole at all. This is true because during a honing operation the stone assemblies 64 and 66 will move outwardly beyond the radial extensions of the associated stabilizing guides 132 and 134. The stabilizing guides therefore undergo wear only during a relatively small portion of each honing operation and therefore usually substantially outlast the other wear elements.

The stabilizing guide assemblies 132 and 134 also perform an important secondary function of preventing tilting of the head in a bore even after they no longer positively engage the bore. This function talres place throughout a honing operation and extends the life of the wear elements and improves the performance thereof.

It has been found that by providing stabilizing guide assemblies as shown and described that the other wear elements including the stones 6S and the guides 102 and 110 will wear more evenly over their entire lengths, will be less subject to breakage, and their usable life will therefore be substantially increased. Furthermore, the stabilizing guide assemblies 132 and 134, as already mentioned, will establish an improved pattern of movement for the subject honing head which will enable the head to produce more nearly perfectly round cylindrical honed surfaces. The improved results are due in large part to the improved pattern of head movement and also to the improved wear condition of the surface engaging members. The shoes 136 on the stabilizing guides are also easily replaceable by threaded means as shown in FIGS. 4 and 5.

Thus there has been shown and described a novel honing device for honing cylindrical surfaces and the like which fulfills all of the objects and advantages sought therefor. Many changes, variations, and modifications of the subject device will, however, become apparent to those skilled in the art after considering this specification and the accompanying drawings which form a part thereof. All such changes, variations and modifications which do not depart from the spirit and scope of the invention are deemed to be covered by the invention which is limited only by the claims which follow.

What is claimed is:

1. A honing head for honing cylindrical surfaces comprising a body having a pair of stone assemblies mounted in opposed relationship thereon and a pair of guide assemblies also mounted in opposed relationship thereon to define four locations on a cylindrical circumference for engagement with a surface to be honed, one of said assemblies being resiliently biased outwardly on said body and the other three of said assemblies being relatively rigidly supported thereon for establishing the honing diameter of said head, stabilizing guide assembly mounted on said body substantially in axial alignment with each of said stone assemblies, each of said stabilizing guide assembly including means for adjusting the radial extended posit-ion thereof on the body, said stabilizing guide assemblies having wear elements thereon that engage a surface being honed at the beginning of a honing operation in order to establish a proper axial movement for said head, and means for p-ivotally mounting said head on a honing machine.

2. A device for honing internal cylindrical surfaces and the like comprising an elongated body having pairs of opposed surfaces and an axial bore extending substantially through the center thereof, a pair of assemblies each having an abrasive element positioned thereon, means for mounting said assemblies on the body spaced approximately 170 apart circumferentially, a third assembly mounted adjacent to one of said other pair of opposed surfaces opposite from the 170 angle between the abrasive elements, said third assembly having a wear element thereon for slidably engaging a surface to be honed, said abrasive elements and said wear elements defining three surface contacting points which determine the honing diameter of the device, means mounting at least one of said assemblies for radial movement on said body to change the honing diameter of the device, said last named means including an operator member axially slidable in said body bore, said operator member having a beveled surface thereon facing angularly toward the radially movable assembly, means engageable with the beveled surface and with said movable assembly to support said assembly,

the radial supported position of said movable assembly changing in response to axial movement of the operator member in the body bore, and external control means engageable with said operator member for changing the position thereof in the bore.

3. The honing device defined in claim 2 wherein both of said assemblies having abrasive elements are radially movable on said body, said operator member having at least one beveled surface that faces each of said movable assemblies, said beveled surfaces on the operator member being circumferentially spaced by approximately 170 and aligned with the respective abrasive assemblies.

4. The honing device defined in claim 2 including a fourth assembly located on the body substantially opposite from said third assembly, said fourth assembly having a wear element with a surface thereon that slidably engages a surface to be honed, and means on said body resiliently urging said fourth assembly outwardly into engagement with a surface to be honed.

5. A honing device comprising an elongated body having an axis of rotation and a first pair of substantially parallel surfaces on opposite sides of said axis, means for mounting a guide assembly including a wear element adjacent to one of said opposite body surfaces, two other surfaces on opposite sides of said body axis, said other surfaces being parallel to the axis of rotation but angularly related to each other, a stone assembly mounted on said body adjacent to each of said other body surfaces, said stone assemblies each having a honing stone thereon engageable with a surface to be honed, said stones and said guide element determining the honing diameter of the device, a pair of stabilizing guide assemblies mounted respectively adjacent to the said other body surfaces associated with the stone assemblies, each of said stabilizing guide assemblies having a guide element substantially in alignment with the associated stone, and means for radially adjusting the positions of said stabilizing guide assemblies on the body so that they simultaneously engage opposite sides of a surface to honed only during the initial portion of a honing operation.

6. The honing device defined in claim 5 wherein said stabilizing guide assemblies include mounting pins and said body includes bores for slidably receiving said mounting pins, said radial adjustment means including means engageable with said mounting pins to change the radial extension of said associated stabilizing guide assemblies on the body, and means attached to the body and engageable with said adjustment means to retain and stabilizing guides in selected adjustment positions.

7. The honing device defined in claim 5 wherein said stabilizing guide assemblies include surface engaging elements and mounting pins therefor, said surface engaging elements being resiliently pivotal relative to the associated mounting pins.

3. A device for honing internal cylindrical surfaces comprising a body having a bore therethrough, a pair of assemblies having abrasive sticks thereon mounted on opposite sides of the body, means for moving said assemblies radially on said body to change the honing diameter of the device, said last named means including an operator member movable axially in the body bore, said operator member having at least one beveled surface thereon facing toward each of the assemblies of said pair of assemblies, a separate follower member for adjusting the radial position of each of said assemblies, each of said follower members having one surface thereon engageable in surface-to-surface contact with one of said beveled surfaces on the operator member and another surface engageable in surface-to-surface contact with the associated assembly, and a third assembly mounted on the body at a location circumferentially spaced from the aforesaid assemblies, said third assembly having a wear element thereon engageable with a cylindrical surface being honed, said wear element and said abrasive sticks defining three surface engaging members which dctermine the honing diameter of the device, a stabilizing assembly associated with each of said abrasive assemblies, each of said stabilizing assemblies being mounted on the body in axial alignment with its associated abrasive assembly and including a wear element engageable with a surface being honed, and means for adjusting the radial position of each of said stabilizing assemblies to enable said assemblies to simultaneously engage opposite sides of a surface being honed during the early portion of a honing operation.

9. Means for honing internal cylindrical surfaces and the like comprising an elongated body member having an axial bore and spaced opposed pairs of peripheral surfaces therearound, a hone assembly mounted adjacent to each surface of one of said pairs of surfaces, means mounting said hone assemblies for radial movement on said body to change the honing diameter thereof, a guide assembly mounted on another one of said body surfaces, said hone assemblies and said guide assembly each having a portion engageable with a cylindrical surface to be honed, said last named three portions defining a honing diameter, means for changing the radial postion of at least one of said assemblies on said body to change the honing diameter thereof, and other surface engaging means on said body in axial alignment with each of said honing assemblies, said other means having portions thereon that engage a surface to be honed to axially orientate the body relative to a surface being honed, and means for adjusting the radial positions of said other surface engaging means on said body.

10. The means defined in claim 9 wherein said surface engaging portions of said other means are pivotal relative to the body.

11. The means defined in claim 9 wherein a fourth assembly is mounted on the opposite side of said body from the aforementioned guide assembly, and means resiliently biasing said fourth assembly radially outwardly on the body into engagement with a surface being honed.

12. A device for honing internal cylindrical surfaces and the like comprising a body having a bore substantially through the center thereof, a pair of assemblies each having an abrasive element positioned thereon located on opposite sides of said body, a third assembly positioned on said body in spaced circumferential relationship to the aforesaid assemblies, said third assembly having a surface thereon that slidably engages a surface to be honed, said abrasive elements and said last named surface defining three points on a circle the diameter of which is the honing diameter of the device, means mounting at least one of said assemblies for radial movement on said body to change the honing diameter, said last named means ineluding a first plunger member radially movable in said body, said plunger member having an outer end surface engageable with said radially movable assembly and an inner end surface angularly related to said outer end surface, a second plunger member movable axially in the body bore, said second plunger member having a surface thereon in substantially fiat surface-to-suriace sliding engagcment with the inner end surface of the aforesaid first plunger member, and means for moving said second plunger member axially in the body bore to radially reposition the associated assembly on the body.

13. The honing device defined in claim 12 wherein both of said abrasive assemblies are radially movable on said body, each of said assemblies having associated therewith a similar first plunger member radially movable in the body, said first plunger members being axially spaced from each other on the body, said second plunger member having a separate surface thereon in surface-to-surface sliding contact with each of said first plunger members.

14. The honing device defined in claim 12 wherein a fourth asscmbiy is mounted on said body in substantially opposed relationship to said third assembly, said fourth assembly having a surface thereon that slidably engages a surface to be honed, and means resiliently biasing said fourth assembly radially outwardly on said body whereby said fourth assembly is self-adjusting to a position engaging a surface being honed.

15. The honing device defined in claim 12 wherein a stabilizing guide assembly is mounted on said body substantially in axial alignment respectively with each of said abrasive assemblies.

16. The honing device defined in claim 15 wherein means are provided in association with each stabilizing guide assembly for adjusting the radial positions thereof on the body.

17. A honing head for use on a honing machine for honing cylindrical surfaces and the like comprising a rotatable body having two abrasive assemblies and a guide assembly arranged in circumferentially spaced relationship therearound, said abrasive assemblies being positioned in opposing relationship and said guide assembly being positioned to apply force in a direction to maintain the abrasive assemblies engaged with a surface being honed, the positions of said stone and guide assemblies determining the honing diameter of the head, means for radially moving at least one of said assemblies to change the honing dliameters, said last named means having operative connection to control means in the honing machine, and a pair of opposed stabilizing guide assemblies spaced axially on said body from the aforesaid assemblies, each of said stabilizing guides including means for adjusting the radial position thereof to engage a cylindircal surface being honed during a predetermined portion only of a honing operation.

18. A honing device for honing internal cylindrical surfaces and the like comprising a body having a bore through the center thereof, means for rotating the body about said bore, a pair of assemblies each having an abrasive element positioned respectively on opposite sides of the body and spaced circumferentially approximately apart relative to the axis of rotation thereof, a third assembly positioned on said body in spaced relationship to the aforementioned abrasive assemblies and on the side of the body opposite from the 170 angular relationship between the abrasive elements, said third assembly having a guide element thereon engageable with a surface being honed, the radial positions of said abrasive elements and said guide element determining the honing diameter of the device, means for radially moving at least one of said assemblies on said body to change the honing diameter, said last named means including a member positioned for radial movement in said body, said member having an outer surface engageable with said radially movable assembly and an inner surface angularly related to said outer surface, adjustment means axially movable in the body bore and having a surface thereon in surface-tosurface sliding contact with said inner surface, and means for moving said adjustment means to radially reposition the associated movable assembly on said body.

i The honing device defined in claim 18 wherein a fourth assembly is mounted on said body in substantially opposed relationship to said third assembly, said fourth assembly having a surface thereon engageable with a surface to be honed, and means resiliently biasing said fourth assembly radially outwardly on said body into engagement with a surface being honed.

20. The honing device defined in claim 18 including a stabilizing guide assembly mounted on said body in axial alignment with each of said abrasive assemblies.

21. The honing device defined in claim 20 wherein said stabilizing guide assemblies include means for adjusting the radial positions thereof on the body, said stabilizing guide assemblies having work engaging surfaces shaped to enter a cylindrical surface being honed with minimum resistance.

22. The honing device defined in claim 18 including means for maintainin the inner surface of the radially movable member in surface-to-surface contact with the cooperating surface of the adjusting means.

(References on foilowing page) 12 FOREIGN PATENTS 1 1 References Cited UNITED STATES PATENTS 326,623 3/1930 Great Britain.

Hfil'tfil p 1 E 10/1933 Sunmn 5 LH SDT A 1f.- SWINGLE, i l y xrvlmmer- 9 19 1 Calvert 51 33 .1. 5-1 ENCER OVERHOLOEix, Exfl nfl 11/ 1962 Czubak 51346 D. G. KELLY, Assistant Examiner.

1/1935 Zimmerman 51-343 

1. A HONING HEAD FOR HONING CYLINDRICAL SURFACES COMPRISING A BODY HAVING A PAIR OF STONE ASSEMBLIES MOUNTED IN OPPOSED RELATIONSHIP THEREON AND A PAIR OF GUIDE ASSEMBLIES ALSO MOUNTED IN OPPOSED RELATIONSHIP THEREON TO DEFINE FOUR LOCATIONS ON A CYLINDRICAL CIRCUMFERENCE FOR ENGAGEMENT WITH A SURFACE TO BE HONED, ONE OF SAID ASSEMBLIES BEING RESILIENTLY BIASED OUTWARDLY ON SAID BODY AND THE OTHER THREE OF SAID ASSEMBLIES BEING RELATIVELY RIGIDLY SUPPORTED THEREON FOR ESTABLISHING THE HONING DIAMETER OF SAID HEAD, A STABILIZING GUIDE ASSEMBLY MOUNTED ON SAID BODY SUBSTANTIALLY IN AXIAL ALIGNMENT WITH EACH OF SAID STONE ASSEMBLIES, EACH OF SAID STABILIZING GUIDE ASSEMBLY INCLUDING MEANS FOR ADJUSTING THE RADIAL EXTENDED POSITION THEREOF ON THE BODY, SAID STABILIZING GUIDE ASSEMBLIES HAVING WEAR ELEMENTS THEREON THAT ENGAGE A SURFACE BEING HONED AT THE BEGINNING OF A HONING OPERATION IN ORDER TO ESTABLISH A PROPER AXIAL MOVEMENT FOR SAID HEAD, AND MEANS FOR PIVOTALLY MOUNTING SAID HEAD ON A HONING MACHINE. 